Automatic shutter-starting device for photographic cameras



- l. BOGOPOLSKY.

AUTOMATIC SHUTTER STARTING DEVICE FOR PHOTQGRAPHIC CAMERAS. APPLICATION H'LED MAR. 17, I920- 1,408,976. Patented Mar: 7., 1922.

JACQUES BOGOPOLSKY, OF

POUR LEXPLOITATION AUTOMATIC SHUTTER-STARTIN G DEVICE FOR GENEVA, SWITZERLAND, ASSIGNOR T0 SOCIETE ANONYME DINVENTIONS I. S. A.,

O)? GENEVA, SWITZERLAND.

PHOTOGRAPHIC CAMERAS.

Specification of Letters Patent.

Patented Mar. 7, 1922.

Application filed March 17, 1920. Serial No.'366,522.

To all whom it may] concern:

Be it known that I, JACQUES BOGOPOLSKY, citizen of the Republic of Ukraine, residing at Geneva, Canton of Geneva, in the Confederation of Switzerland, have invented certain new and useful Improvements in Automatic Shutter-Starting Devices for Photographic Cameras, of which the following is a specification.

The invention relates to automatic starting devices for shutters of photographic cameras of any construction whatever, and it is intended to provide a reliable means for having the said shutter successively and automatically opened and closed at apredetermined time and for a predetermined length of exposure.

The invention consists substantially in the combination of a main spring acting upon an axis, the rotation of which is controlled by any well-known regulator whatever so as to turn at a constant speed, the said axis being fitted with suitably adjustable devices (cams .or the like), intended to successively act upon two levers, one of which causes the opening of the shutter and the other one the closing of the same.

The accompanying drawing shows different constructions illustrating the invention.

Each of the Figures 1 to 3 shows diagrammatically one construction of the mechanism.

The Figures 4 and 5 show details of the construction shown in Figure 3.

In the construction shown in Figure 1, a is a spring barrel, the speed of which is con; trolled by the wheels h, acting. .upon a speeo re ulator consisting of a fly wheel.

The axis of the spring barrel it carries a fixed cam 12 and an adjustable disk (1 and a 7 projection f of the lever 0 cam 6 which is adjustable with regard to the cam b. v

In front of the said two cams b and 6 two starting levers-o and c are provided. The lever c hasa projection 7 which engages a lever 71 and tends to maintain the same in its depressed position shown in full lines in Fig.1. Thesaid lever 2' acts upon oneen'd of a spiral spring 7, the other end of which bears upon the bottom of a cylindrical slide smoving'in afixedcylindrical guide it. The bottom of the cylinder 8 is supported by a acted upon by the cam 6 and a spiralspring r which is weaker than the spring 1 which tends to force the said cylinder 8 downward when the projection f cam 6 V The lever 2' acts upon the piston t of a Bowden w, connected by means of a flexible cable to the shutter.

spring 0 causes the levers c and c to return to their starting position shown in ig. 1, whenever they have been acted upon by their respective cams b and b By suitably regulating the angular posit1on of the cam Z2 with regard to the cam 12, it is possible to fix the time which elapses be tween their respective action.

When the device has actuated the shutter, the lever z is placed in the position shown by dotted lines in Fig. 1, and hence it may be brought again to its initial position shown in full lines by any suitable means whatever, (not shown) causing the slide 8 to be depressed and the spiral spring 1' to be compressed as shown until the bottom of the slide 8 is engaged by the projection f of the lever 0 The spring is then wound up and the barrel set in such an angular position that it will have to turn one complete revolution before the cam 32 opens the shutter.

The gear wheels'are provided with a stopping device, which may be released whenever it is desired to start the apparatus.

This allows the operator to do such releaslng after he has set his camera into position, and he may then effect the release and go to a point where he himself will be included and taken in the picture when the automatic device opens the shutter.

In the construction shown by is again a spring barrel a and trolling gears h. The axis of the spring barrel also carries a fixed cam 12 and an adjustable disc d with a cam 6 in the paths of which are provided two levers c and c having suitable projections f and f respectively.

The projection gengages a lever j intended to act upon the owden 'w, as shown, and the spiral spring 7 connects the said lever to a lever 12 which is provided with a spiral spring 7 weaker than the spring 7*, the other end of which is secured to a fixed point of the casing.

To use this device it is first necessary to raise the lever m to its upper position as shown in the drawing when the projection of the lever c engages in the corresponding recess of said lever m, whereby the is retracted by the action of the Fig. 2 there speed conengages the lever o and engages the projection f opening and spring 1 is suitably extended, the lever i being held in its depressed position by the pro jection f of the lever 0. Whenever the cam 1) acts upon this lever 0, the spring 1 pulls the arm is of the'lever z from the full line position to that indicated by dotted lines at 76?, and the Bowden w is acted upon, as shown in the drawing. When the cam 7) acts in turn upon the lever 0 the projection f is retracted and both levers y' and n are thrown back totheir starting position.

In the construction shown in Figs. 3 to 5 there is again provided a spring barrel a with a fixed cam Z) and an adjustable cam 6 The train of gears controlling the speed of rotation of the barrel a is not shown as it may be of the same construction as hereinbefore described. There is a piston U, carrying a head-piece 2', 7c, and sliding in a bearing V, connected by means of a spiral spring 7", to the starting lever m. A spiral spring 1 is placed between the head piece 2' and the bearing V.

The lever m has a tooth or projection a, which engages a projection f of the lever 0 acted upon by a spring 0 and the lever c is provided with a tooth or projection f intended to engage the'head piece 2' as shown in dotted lines in Fig. 6.

Fig. 5 shows the construction of the spring barrel axis a of Fig. 4:. b is the fixed cam and (Z is an adjustable disc which is pressed by a spiral spring 3 against the disc d, fixed to the barrel a. The said adjustable disc (Z carries the cam 6 therefore the angular'position of the cam b with regard to the'cam Z) is obtained by suitably setting the adjustable disc don the barrel a.

- The operation of this construction is as follows'.

The operator lifts the" lever m, therei by expanding the spring 1" until the tooth n g of thelever 0 This causes the head'i to engage the projection 7 of the lever c and to hold back the bearing V to which the spring 1' is attached.

\Vhen the cam 6 acts upon the lever 0, the

projection f is withdrawn and the head "i of the piston U is released and'its head strikes the piston t of the bowden, causing the shutter to be opened.

As soon'as the cam 11 strikes the spring 2 of the lever 0 the projection f is withdrawn and the lever m released so that both lever m and piston U are thrown back into their lower positionwhen the shutter is being closed again. i I claim as my invention:

"1. An apparatus for operating shutters for photographic cameras comprising a shaft, means for turning the same at a constant speed, means for opening and closing the shutter, arms for actuating the means for closing the shutter, tension devices associated with thesaid arms, levers for normally maintaining the said arms in initial positions, and adjustable devices on the said shaft for tripping the said arms for successively actuating the devices for opening and closing theshutterto first open and then close the same. V

2. An apparatus for operating shutters for photographic cameras comprising a shaft, means for turning the same at a constant speed, means for opening and closing the shutter, arms for actuating the means for opening and closing the shutter, a tension device connecting the said arms so that when both are released they move together, levers for normally maintaining said arms in initial positions, adjustable devices on the said shaft for successively tripping'said arms to first release one arm, permitting the same to be actuated by the tension device to actuate the means for opening and closing the shutter to open the same and then for tripping the other arm to release both the said arms, and tension devices for then actuatingb'oth the said arms to return one of the same -to its initial position. 1 Y 3.- An apparatus for operating shutters for photographic cameras comprising a shaft, means for turning the same at a constant speed, means-for-opening andclosing the shutter, pivotally mounted arms for actuating the means for opening andclosing the shutter, a spring connecting the free ends of the said arm, pivotally mounted levers for normally maintaining the said'arms in initial positions, adjustable devices on the said shaft, one of which is adapted to engage. one of the said levers to release one ;of the said arms permitting the actuation of the same by the said tension device to operate thelmeans for opening and closing' the shutter to open the same and-the other adjustable device to engage the other arm-ito release the other lever topermit the operation of'the means for opening and closing the shuter to close the same, and a springfor moving the se c'ond arm for actuating the means for opening and closing'th'e' shutter to close the same and simultaneously to return the first arm to to release thesecon d arm, and a tension device for actuatingthe said second arm when thus released to operate the means for openingand elosingthe shutter to close the same.

the'said shaft'for engaging thesecond lever.

5. An apparatus for operating shutters for photographic cameras comprising a shaft, means for turning the said shaft at a constant speed, means for opening and closing the shutter, an arm, a lever, a device adjustably mounted on the shaft for engaging the lever to release the said arm, a second arm, a second lever, a second device adjustably mounted on the said shaft, a spring connecting the said arms whereby when the first aforesaid arm is released the same is actuated to operate the means for opening and closing the shutter to open the same, and a tension device for simultaneously actuating both said arms when the said second arm is released for actuating the means for opening and closing the shutter to close the same.

6. An apparatus for operating shutters for photographic cameras comprising a shaft, means for turning the said shaft at a constant speed, a Bowden device for opening and closing the shutter, an arm, a lever, a cam revolubly adjustable on the said shaft shaft for engaging for engaging the said lever to release the said arm, a second arm, a second lever, a second cam revolubly adjusted on the said said second lever to release the said second arm, a spring connecting the free ends of the said arms whereby when the first aforesaid arm is released the same is actuated to operate the said Bowden device to open the shutter, and a tension device for simultaneously actuating both the said arms when the said second arm is released by the said second adjustable cam for simultaneously actuating the said levers to cause the said second arm to engage the Bowden device to actuate the same for closing the said shutter.

In testimony whereof I aflix my signature in presence of two witnesses.

JACQUES BOGOPOLSKY.

Witnesses:

J. A. PIERRE, M. INUS. 

